The Cubs reassigned Rea to their minor-league camp Saturday, Mark Gonzales of the Chicago Tribune reports.
Rea was a prospect of some repute while coming up in the Padres organization, but multiple injuries have derailed his development. The right-hander didn't appear in any Cactus League games while tending to an unspecified issue, making it uncertain if he'll be ready to pitch once the minor-league season gets underway.